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Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
Did you know?
In 1864, the first barbiturate (barbituric acid) was synthesized.
Did you know?
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.